Hi, I was not able to do it using Caravan, but it is very easy to set up a watch-only wallet for your Unchained vault(s) using Sparrow. Some tips here… Sparrow Wallet (Desktop)
I am now able to view my multi-sig vaults at Unchained using Sparrow connected to my node over TOR.
You can also use Sparrow as a fully functional wallet, but I opted to set it up as watch-only without connecting my signing devices.